CN-122011551-A - Preparation method of self-response fire-extinguishing profile, fire-extinguishing profile and application of fire-extinguishing profile

Abstract

The invention belongs to the technical field of functional profiles. The preparation method of the self-response fire-extinguishing profile comprises the following steps of mixing, by mass, 95-105 parts of a polyethylene base material, 5-15 parts of fire-extinguishing microcapsules and 1-10 parts of organically modified platy fillers at 25-35 ℃ to obtain a premix. The interfacial compatibility of the organically modified platy filler and the polyethylene substrate is lower than that of the fire extinguishing microcapsule and the polyethylene substrate. And (3) carrying out melt blending, extrusion and granulation on the premix to obtain the composite master batch. And carrying out injection molding on the composite master batch. The self-response fire-extinguishing profile prepared by the invention not only solves the problem of stable compounding of the fire-extinguishing microcapsule in the nonpolar plastic matrix, but also spontaneously constructs optimized spatial distribution of fire-extinguishing functions in the profile through innovative material combination and process regulation, thereby realizing the unification of structural performance and fire-extinguishing efficiency.

Inventors

• HU XIAOYING
• Weng Chaofan
• ZHANG DONGBIAO
• XU MAOSHENG

Assignees

• 杭州照相机械研究所有限公司

Dates

Publication Date

20260512

Application Date

20260303

Claims (10)

1. 1. The preparation method of the self-response fire-extinguishing sectional material is characterized by comprising the following steps of: s1, mixing 95-105 parts by weight of a polyethylene base material, 5-15 parts by weight of a fire extinguishing microcapsule and 1-10 parts by weight of an organically modified flaky filler at 25-35 ℃ to obtain a premix; Wherein the interfacial compatibility of the organically modified platy filler with the polyethylene substrate is lower than the interfacial compatibility of the fire extinguishing microcapsule with the polyethylene substrate; S2, carrying out melt blending, extrusion and granulation on the premix to obtain composite master batches; s3, carrying out injection molding on the composite master batch; The technological parameters include the temperature of the mold being 30-40 ℃, the temperature of the melt being 140-160 ℃, the injection speed being 40-60 mm/s and the injection pressure being 70-90 MPa.
2. 2. The method for preparing a self-response fire-extinguishing profile according to claim 1, wherein the organically modified platy filler is obtained by treating one of layered silicate or two-dimensional nanomaterial with an organic modifier.
3. 3. The preparation method of the self-response fire-extinguishing profile according to claim 2, wherein the layered silicate is one of montmorillonite, mica or talcum powder, and the two-dimensional nanomaterial is one of graphene/graphene oxide, boron nitride or MXene; Wherein the chemical formula of MXene is M n+1 X n T x ; M is Ti, V, mo, nb, X is C or N, T X is one of-OH, -O, -F and-Cl functional groups, and N is a natural number.
4. 4. The method for preparing a self-response fire-extinguishing profile according to claim 2, wherein the organic modifier is one of alkyl quaternary ammonium salt, silane coupling agent and stearic acid/stearate.
5. 5. The preparation method of the self-response fire-extinguishing profile according to claim 1 is characterized in that in the step S1, 1-5 parts by mass of flame retardant is added and mixed with 100 parts of polyethylene base material, and then the mixture is mixed with 5-15 parts of fire-extinguishing microcapsule and 1-10 parts of organically modified flaky filler to obtain premix.
6. 6. The method for preparing a self-responding fire-extinguishing profile according to claim 5, wherein the flame retardant comprises at least one of pentaerythritol, ammonium polyphosphate, melamine polyphosphate.
7. 7. A fire extinguishing profile, characterized in that it is prepared by the method according to any one of claims 1 to 6.
8. 8. The fire extinguishing profile according to claim 7, wherein the volume fraction of the fire extinguishing microcapsules is 1.2-2.0 times the average volume fraction of the whole microcapsules in a surface layer area 0-0.5 mm from the outer surface of the profile.
9. 9. A fire extinguishing profile according to claim 7, characterized in that the content of the organized modified platelet filler is lower in the surface area of the profile than in the core area of the profile.
10. 10. The fire-extinguishing profile according to claim 7, wherein the fire-extinguishing profile is applied to building materials, internal structural members of a battery pack of a new energy automobile or cable trays.

Description

Preparation method of self-response fire-extinguishing profile, fire-extinguishing profile and application of fire-extinguishing profile Technical Field The invention belongs to the technical field of functional profiles, and particularly relates to a preparation method of a self-response fire-extinguishing profile, the fire-extinguishing profile and application of the self-response fire-extinguishing profile. Background With the increasing demands of society on fire safety, how to promote the passive fireproof capability of key infrastructure and important equipment becomes an important subject in the crossing field of material science and fire control technology. Traditional fire protection strategies rely primarily on the addition of fire extinguishing systems or the application of fire protection coatings to the surface of the structure, which have problems with delayed response, high maintenance costs, or impact on the performance of the structure itself. Therefore, the development of the composite material section bar with the intrinsic self-response fire extinguishing capability and without influencing the main structural performance has urgent needs and great significance. The idea of microencapsulating a fire extinguishing agent and dispersing the agent as a functional filler in a matrix material is a widely focused idea. The document CN202511579266.0, for example, discloses a microcapsule fire blanket, the core of which is to bond the fire-extinguishing microcapsules and the refrigerating microcapsules directly to the surface of a flexible blanket body made of glass fiber, ceramic fiber, etc. through adhesive glue. The fire extinguishing mechanism is that when fire happens, the blanket body is covered on a fire source, the surface microcapsule is heated and broken, the fire extinguishing agent and the cooling liquid are released, and the fire extinguishing is realized by combining the physical isolation effect of the blanket body. However, this solution has inherent, difficult to overcome limitations: First, its fire extinguishing function is entirely dependent on the physical attachment of the surface bonds. The microcapsules are fixed to the surface of the blanket by an external adhesive, which bonding is inherently weak. Under handling, folding, friction or prolonged environmental stresses, the adhesive interface is prone to failure, resulting in microcapsule shedding and permanent loss of function. Secondly, it is clearly required that the base material is a fiber braid of glass fibers, ceramic fibers, high silica fibers, polyimide fibers or the like. These materials are capable of forming strong mechanical interlocking and physical/chemical adsorption with the adhesive glue. However, for general-purpose thermoplastics for large-scale applications such as Polyethylene (PE) and polypropylene (PP), it is almost impossible to obtain a stable and durable functional layer by one touch if an attempt is made to fix the microcapsules on the surface of the PE profile by means of gluing. Thirdly, a large number of microcapsules are used as an additional layer to be attached to the surface of the profile, so that the size and the surface morphology of the profile can be changed, and stress concentration points can be introduced to influence the assembly precision, the bearing capacity and the fatigue resistance of the profile as a structural member. Disclosure of Invention Aiming at the problems, the invention aims to provide a preparation method of a self-response fire-extinguishing section bar so as to obtain the self-response fire-extinguishing section bar with a gradient distribution structure. The method solves the problem of stable compounding of the fire-extinguishing microcapsule in the nonpolar plastic matrix, and automatically constructs optimized spatial distribution of fire-extinguishing functions in the section bar through innovative material combination and process regulation, thereby realizing unification of structural performance and fire-extinguishing efficiency. The specific technical scheme of the invention is as follows: the preparation method of the self-response fire-extinguishing sectional material comprises the following steps: s1, mixing 95-105 parts by weight of a polyethylene base material, 5-15 parts by weight of a fire extinguishing microcapsule and 1-10 parts by weight of an organically modified flaky filler at 25-35 ℃ to obtain a premix; Wherein the interfacial compatibility of the organically modified platy filler with the polyethylene substrate is lower than the interfacial compatibility of the fire extinguishing microcapsule with the polyethylene substrate; S2, carrying out melt blending, extrusion and granulation on the premix to obtain composite master batches; s3, carrying out injection molding on the composite master batch; The technological parameters include the temperature of the mold being 30-40 ℃, the temperature of the melt being 140-160 ℃, the injection speed